What it is
This ingredient is a copolymer of ethylene oxide and propylene oxide capped with methyl ether groups, giving a water-miscible liquid. In sunscreens it works as a humectant that helps attract and hold moisture and as a solvent that aids in dissolving and distributing other ingredients. It can also improve the spread and overall sensory feel of a formula.
Safety & warnings
This polyether is generally well tolerated with low irritation and sensitization potential at cosmetic use levels.
Origin & sourcing
Synthetic ingredient produced by copolymerizing ethylene oxide and propylene oxide and end-capping with methyl ether groups.
Questions everyone asks
What does this ingredient do in a sunscreen?
It acts as a humectant and solvent, helping hold moisture and dissolve other ingredients while improving spreadability.
Is it the same as PEG used as a thickener?
No. This is a low-viscosity polyether liquid used mainly for moisture and solubility, not for thickening.